Particles are not affected from Physical Wind

[yigitakkok]

Hi, I have particles and I want them to affected from physical wind. My car is affected from wind ( can't reach maximum speed) but particles are not affected.

 

Here is my code:

pos_araba = target_car.getPosition();
			vec3 direc = target_car.getDirection();
			vec3 windvolumepos = pos_araba + rotateZ(180.0 * atan2(direc.y, direc.x) / PI) * vec3(5.0, -5.0, 1.0);
			//MUZAFFER: rüzgar
			wind = add_editor(new PhysicalWind(vec3(10,20,10)));
			wind.setLinearDamping(0.16f);
			wind.setAngularDamping(0.16f);
			wind.setVelocity(vec3(0.0f,0.0f,5.0f));
			wind.setWorldTransform(translate(windvolumepos));
			
			volume = add_editor(new ObjectVolumeBox(vec3(10,20,10)));
			volume.setMaterial("volume_fog_base","*");
			volume.setMaterialParameter("diffuse_color",vec4(1.0f,0.0f,0.0f,0.0f),0);
			volume.setWorldTransform(translate(windvolumepos));

To check out where is the wind box is I created a volume box.

 

Here is my code for particles:

particlesbaca = add_editor(new ObjectParticles());
			particlesbaca.setMaterial("particles_base","*");
			//particlesbaca.setMaterialParameter("diffuse_color",vec4(1.0f,0.0f,0.0f,0.0f),0);
			particlesbaca.setMaterialParameter("diffuse_color",vec4(0.3f,0.3f,0.3f,0.0f),0);
			particlesbaca.setWorldTransform(translate(Vec3(0.0f,2.0f,1.5f)));
			particlesbaca.setParticlesType(OBJECT_PARTICLES_TYPE_LENGTH);
			particlesbaca.setSpawnRate(300.0f); //saniyede kaç tane üretilecek
			particlesbaca.setLengthStretch(0.01f); //uzatma 
			particlesbaca.setLinearDamping(0.0f);
			particlesbaca.setEmitterType(OBJECT_PARTICLES_EMITTER_POINT);
			particlesbaca.setEmitterDirection(vec3(0.1f,0.0f,0.1f));//target_car.getBackPosition()); //yönü
			particlesbaca.setEmitterSpread(vec3(0.0f,0.0f,0.0f));  //particialların alanı
			particlesbaca.setEmitterSize(vec3(0.0f,0.0f,0.0f)); //boyut
			particlesbaca.setEmitterEnabled(1);
			particlesbaca.setGravity(vec3(0.0f,0.0f,-9.8f));
			particlesbaca.setLife(2.0f,0.0f);
			particlesbaca.setRadius(0.1f,0.5f);
			particlesbaca.setVelocity(10.0f,0.0f);
			particlesbaca.setCulling(1);
			particlesbaca.setCollision(0);
			particlesbaca.setIntersection(0);
			particlesbaca.setEnabled(1);
			particlesbaca.setParent(target_car.getObject());

Should I turn or off an attribute for particles?

[ulf.schroeter]

As far as I know particles do not take part in physics simulation. You can use ObjectParticles.addForce() to simulate wind influence.

[yigitakkok]

But in here (https://developer.unigine.com/en/docs/1.0/objects/effects/particles/#physical) it says:

 

Besides being thoroughly physical from the point of view of internal simulation (simulation parameters are dwelt below), the particles can also accurately interact with the environment through physical nodes: wind, force and water.

 

So I think particles should be affected.

[ulf.schroeter]

yep, you're right. In this case maybe you have to specify particle mass via ObjectParticles.setPhysicalMass() ? Maybe it's initialized by default to a value of 0.0, effectively disabling physical interaction.

[yigitakkok]

I have set physical mask to 100.0f but still no change...  :unsure:

[ulf.schroeter]

setPhysicalMASK() takes into argument and should be set to same bit mask value (e.g. 1) as the Wind object, so the particles get affected by the wind object.

 

In addition also use setPhysicalMASS() for assigning particle weight. I would use a smaller mass value e.g. 0.1 or 1.0 for testing.

[yigitakkok]

Actually I did set mass to 100.0f. Sorry for mistake.

 

Now I have set values according to your answer:

 

particlesbaca.setPhysicalMask(wind.getPhysicalMask());

particlesbaca.setPhysicalMass(1.0f);

 

But still no effect.

[ulf.schroeter]

Have you also previously set non-0 physical mask value for wind object (e.g. PhysicalWind.setPhysicalMask(1) ) ?

[yigitakkok]

I did not but I checked the value of wind.getPhysicalMask and it is 1 already.

[ulf.schroeter]

Ok, that I have no more ideas left, sorry. I think it would be helpful if you could provide a minimalistic test scene illustrating the problem for evaluation by Unigine crew  

[maxi]

Hi Yiğit,

 

I've just created test scene with wind and particles with your parameters, add physical mass and it works:

        PhysicalWind wind = addToEditor(new PhysicalWind(vec3(1000.0f)));
	wind.setVelocity(vec3(-5.0f,0.0f,1.0f));
	wind.setLinearDamping(8.0f);
	wind.setAngularDamping(8.0f);
	
	ObjectParticles particles = addToEditor(new ObjectParticles());
	particles.setMaterial("particles_base","*");
	particles.setMaterialParameter("diffuse_color",vec4(0.3f,0.3f,0.3f,0.0f),0);
	particles.setWorldTransform(translate(Vec3(0.0f,2.0f,1.5f)));
	particles.setParticlesType(OBJECT_PARTICLES_TYPE_LENGTH);
	particles.setSpawnRate(300.0f); //saniyede ka? tane ?retilecek
	particles.setLengthStretch(0.01f); //uzatma 
	particles.setLinearDamping(0.0f);
	particles.setEmitterType(OBJECT_PARTICLES_EMITTER_POINT);
	particles.setEmitterDirection(vec3(0.1f,0.0f,0.1f));//target_car.getBackPosition()); //y?n?
	particles.setEmitterSpread(vec3(0.0f,0.0f,0.0f));  //particiallar?n alan?
	particles.setEmitterSize(vec3(0.0f,0.0f,0.0f)); //boyut
	particles.setEmitterEnabled(1);
	particles.setGravity(vec3(0.0f,0.0f,-9.8f));
	particles.setLife(2.0f,0.0f);
	particles.setRadius(0.1f,0.5f);
	particles.setVelocity(10.0f,0.0f);
	particles.setCulling(1);
	particles.setCollision(0);
	particles.setIntersection(0);
	particles.setEnabled(1);
	particles.setPhysicalMass(0.057f);

Changing wind velocity or enabling/disabling it, changes particles direction.

 

If this wont help, please send us your test scene.

[yigitakkok]

Hi Yiğit,

 

I've just created test scene with wind and particles with your parameters, add physical mass and it works:

        PhysicalWind wind = addToEditor(new PhysicalWind(vec3(1000.0f)));
	wind.setVelocity(vec3(-5.0f,0.0f,1.0f));
	wind.setLinearDamping(8.0f);
	wind.setAngularDamping(8.0f);
	
	ObjectParticles particles = addToEditor(new ObjectParticles());
	particles.setMaterial("particles_base","*");
	particles.setMaterialParameter("diffuse_color",vec4(0.3f,0.3f,0.3f,0.0f),0);
	particles.setWorldTransform(translate(Vec3(0.0f,2.0f,1.5f)));
	particles.setParticlesType(OBJECT_PARTICLES_TYPE_LENGTH);
	particles.setSpawnRate(300.0f); //saniyede ka? tane ?retilecek
	particles.setLengthStretch(0.01f); //uzatma 
	particles.setLinearDamping(0.0f);
	particles.setEmitterType(OBJECT_PARTICLES_EMITTER_POINT);
	particles.setEmitterDirection(vec3(0.1f,0.0f,0.1f));//target_car.getBackPosition()); //y?n?
	particles.setEmitterSpread(vec3(0.0f,0.0f,0.0f));  //particiallar?n alan?
	particles.setEmitterSize(vec3(0.0f,0.0f,0.0f)); //boyut
	particles.setEmitterEnabled(1);
	particles.setGravity(vec3(0.0f,0.0f,-9.8f));
	particles.setLife(2.0f,0.0f);
	particles.setRadius(0.1f,0.5f);
	particles.setVelocity(10.0f,0.0f);
	particles.setCulling(1);
	particles.setCollision(0);
	particles.setIntersection(0);
	particles.setEnabled(1);
	particles.setPhysicalMass(0.057f);

Changing wind velocity or enabling/disabling it, changes particles direction.

 

If this wont help, please send us your test scene.

It works. Thanks.